Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income Loss [Line Items]
Unrealized gains and (losses) on hedging transactions, Gross	$ (2,581)	$ 7,355
Unrealized gains and (losses) on hedging transactions, Income tax expense (benefit)	(599)	2,096
Unrealized gains and (losses) on hedging transactions, Net	(1,982)	5,259
Unrealized gains and (losses) on investments classified as available-for-sale, Gross	540	(797)
Unrealized gains and (losses) on investments classified as available-for-sale, Income tax expense (benefit)	162	(288)
Unrealized gains and (losses) on investments classified as available-for-sale, Net	378	(509)
Foreign currency translation adjustments	(8,721)	(8,963)
Total accumulated other comprehensive income (loss)	$ (10,325)	$ (4,213)